As you can see, GBA games DO NOT fill the entire screen as previous marketing materials have eluded to

The company is aiming to sell to families with young children, hence the GBA integration

Though Visteon says they're an "automotive company," we're not sure how well they'll do in the portable gaming industry, even having partnered with Nintendo. It would appear to the price sensitive that you might be able to buy a separate GBA and car-installed DVD player at a lower price. But maybe that's not the market they're going for.